How should I return multiple const values from a function?

[Paul Backus]

On Monday, 2 January 2023 at 23:25:48 UTC, Charles Hixson wrote:
>
> They syntax I wanted was something like:
>
> bool func (const out Key k, const out Val v) { k = 
> this.key.dup; v = this.val.dup; return true;    }

This works for me:

     import std.typecons;

     auto func(Key, Value)(Key k, Value v)
     {
         return Tuple!(const(Key), const(Value))(k, v);
     }

     void main()
     {
         string k;
         uint v;
         auto result = func(k, v);

         static assert(is(typeof(result[0]) == const(string)));
         static assert(is(typeof(result[1]) == const(uint)));
     }